GB1282572A - Apparatus for processing echo sounder signals - Google Patents
Apparatus for processing echo sounder signalsInfo
- Publication number
- GB1282572A GB1282572A GB5127668A GB5127668A GB1282572A GB 1282572 A GB1282572 A GB 1282572A GB 5127668 A GB5127668 A GB 5127668A GB 5127668 A GB5127668 A GB 5127668A GB 1282572 A GB1282572 A GB 1282572A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fish
- depth
- echo
- catch
- echoes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/96—Sonar systems specially adapted for specific applications for locating fish
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
1282572 Fishing sonar WHITE FISH AUTHORITY 27 Jan 1970 [29 Oct 1968] 51276/68 Heading H4D [Also in Division G4] For determining the probable rate of catch of fish by a fishing vessel, the number of echoes received in each sounding by an echo sounder from fish in a predetermined depth band is normalized (to compensate for the increasing width of the sounding beam with depth) to obtain a respective quantity corresponding to the number of echoes which would be received if the same fish were a standard depth below the echo sounder, respective estimates of the number of fish caught are derived from these quantities in accordance with a predetermined relationship between the estimate and the said quantity, the estimates are summed over a given time interval, the sum is indicated as an estimated catch rate, and provision is made for up-dating the predetermined relationship. In the embodiment shown on echo sounder receiver channel is provided with time-variedgain (to compensate for sound attenuation with depth) and optional A.G.C. The sea-bed echo and fish echoes are then distinguished by means of amplitude gates 18, 42 and an echo slope gate 44. Gate 25 is opened by a transmitted sound pulse and closed by the resulting sea-bed echo to feed clock pulses to counter 33 giving a digital depth measurement for display at 35 and for normalization purposes. A blanking pulse generator 30 prevents premature closure of the gate 25 by a fish echo. Shift register 49 is arranged to count those fish echoes from a 4 feet high band adjacent the sea-bed (when bottomtrawling), and this count is transferred to a register 54. Normalization is effected at 60, where register 54 count is divided by the square of the depth. In a given fishing operation, the normalized counts are summed on accumulator 76 then divided into the actual catch value of a previous fishing operation to obtain at 82 a factor RA. An assumed correction factor RF is multiplied at 66 by each normalized count to give estimated catch counts which are summed at 71 over two-minute periods to give estimated catch rate values for display at 73 and analogue recording at 75. The estimated catch counts are also summed at 68 over the whole fishing operation to give a total catch display at 70. For the next fishing operation the correction factor RF is updated by allotting the factor RA a weight α at 83, multiplying the old RF factor by 1-α, and summing at 84 product (1-α) x RF with the weighted factor αRA to give a new RF value. In a modification for midwater fishing, shift register 49 and depth counter 33 are not used and instead a manually-controlled time gate feeds fish echoes from a selected depth band to register 54.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5127668A GB1282572A (en) | 1968-10-29 | 1968-10-29 | Apparatus for processing echo sounder signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5127668A GB1282572A (en) | 1968-10-29 | 1968-10-29 | Apparatus for processing echo sounder signals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1282572A true GB1282572A (en) | 1972-07-19 |
Family
ID=10459369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5127668A Expired GB1282572A (en) | 1968-10-29 | 1968-10-29 | Apparatus for processing echo sounder signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1282572A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4777630A (en) * | 1984-03-22 | 1988-10-11 | Salubre Investments Limited | Processing of reflected signals |
GB2523468A (en) * | 2014-02-20 | 2015-08-26 | Furuno Electrical Company Ltd | Detecting device, fish finder and detecting method |
CN113100185A (en) * | 2021-04-28 | 2021-07-13 | 山东理工大学 | Sea cucumber fishing device |
-
1968
- 1968-10-29 GB GB5127668A patent/GB1282572A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4777630A (en) * | 1984-03-22 | 1988-10-11 | Salubre Investments Limited | Processing of reflected signals |
GB2523468A (en) * | 2014-02-20 | 2015-08-26 | Furuno Electrical Company Ltd | Detecting device, fish finder and detecting method |
GB2523468B (en) * | 2014-02-20 | 2018-03-14 | Furuno Electrical Company Ltd | Detecting device, fish finder and detecting method |
CN113100185A (en) * | 2021-04-28 | 2021-07-13 | 山东理工大学 | Sea cucumber fishing device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |